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/*******************************************************************************
* Copyright (c) 2005 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.ui.IWorkbenchPart;
/**
* Abstract implementation of an asynchronous tree contenxt adapter.
* <p>
* Clients may subclass this class.
* </p>
* @since 3.2
*/
public abstract class AsynchronousTreeContentAdapter implements IAsynchronousTreeContentAdapter {
protected static final Object[] EMPTY = new Object[0];
/* (non-Javadoc)
* @see org.eclipse.debug.ui.viewers.IAsynchronousTreeContentAdapter#retrieveChildren(java.lang.Object, org.eclipse.debug.ui.viewers.IPresentationContext, org.eclipse.debug.ui.viewers.IChildrenRequestMonitor)
*/
public void retrieveChildren(final Object parent, final IPresentationContext context, final IChildrenRequestMonitor result) {
Job job = new Job("Retrieving Children") { //$NON-NLS-1$
protected IStatus run(IProgressMonitor monitor) {
if (!monitor.isCanceled()) {
computeChildren(parent, context, result);
}
return Status.OK_STATUS;
}
};
job.setSystem(true);
job.schedule();
}
/* (non-Javadoc)
* @see org.eclipse.debug.ui.viewers.IAsynchronousTreeContentAdapter#isContainer(java.lang.Object, org.eclipse.debug.ui.viewers.IPresentationContext, org.eclipse.debug.ui.viewers.IContainerRequestMonitor)
*/
public void isContainer(final Object element, final IPresentationContext context, final IContainerRequestMonitor result) {
Job job = new Job("Computing hasChildren") { //$NON-NLS-1$
protected IStatus run(IProgressMonitor monitor) {
if (!monitor.isCanceled()) {
computeIsContainer(element, context, result);
}
return Status.OK_STATUS;
}
};
job.setSystem(true);
job.schedule();
}
/**
* Computes the children for the given parent in the specified context.
*
* @param parent parent to retrieve children for
* @param context presentation contenxt
* @param monitor result to report to
*/
protected void computeChildren(Object parent, IPresentationContext context, IChildrenRequestMonitor monitor) {
if (!monitor.isCanceled()) {
IStatus status = Status.OK_STATUS;
try {
if (supportsContext(context)) {
monitor.addChildren(getChildren(parent, context));
}
} catch (CoreException e) {
status = e.getStatus();
}
monitor.setStatus(status);
monitor.done();
}
}
/**
* Computes whether the given element is a container.
*
* @param parent potential parent
* @param context presentation contenxt
* @param monitor result to report to
*/
protected void computeIsContainer(Object parent, IPresentationContext context, IContainerRequestMonitor monitor) {
if (!monitor.isCanceled()) {
IStatus status = Status.OK_STATUS;
try {
monitor.setIsContainer(hasChildren(parent, context));
} catch (CoreException e) {
status = e.getStatus();
}
monitor.setStatus(status);
monitor.done();
}
}
/**
* Returns the children for the given parent in the specified context.
*
* @param parent element to retrieve children for
* @param context context children will be presented in
* @return children
* @throws CoreException if an exception occurrs retieving children
*/
protected abstract Object[] getChildren(Object parent, IPresentationContext context) throws CoreException;
/**
* Returns whether the given element has children in the specified context.
*
* @param element element that may have children
* @param context context element will be presented in
* @return whether the given element has children in the specified context
* @throws CoreException if an exception occurrs determining whether the
* element has children
*/
protected abstract boolean hasChildren(Object element, IPresentationContext context) throws CoreException;
/**
* Returns whether this adapter supports the given context.
*
* @param context
* @return whether this adapter supports the given context
*/
protected boolean supportsContext(IPresentationContext context) {
IWorkbenchPart part = context.getPart();
if (part != null) {
return supportsPartId(part.getSite().getId());
}
return true;
}
/**
* Returns whether this adapter provides content in the specified part.
*
* @param id part id
* @return whether this adapter provides content in the specified part
*/
protected abstract boolean supportsPartId(String id);
}
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